Peelable adhesive composition

ABSTRACT

The invention relates to an adhesive composition comprising at least one natural latex and at least one polymeric composition having a glass transition temperature ranging from −50° C. to 0° C. The invention also relates to a membrane obtained after drying the adhesive composition according to the invention, to a combination of a flexible surface coating with an adhesive composition according to the invention, to a method for applying a flexible surface coating onto a substrate as well as a substrate coated with a peelable adhesive membrane according to the invention.

TECHNICAL FIELD

The present invention relates to a peelable adhesive composition. Theinvention also relates to a peelable membrane obtained by drying theadhesive composition according to the invention. The invention alsorelates to the combination of a surface coating with the peelableadhesive composition, and to a method for applying a surface coating.The invention also relates to a method for renovation of a surfacecoating.

STATE OF THE ART

The replacement of a flexible flooring is an operation which has beenposing many problems to professionals and individuals for a long time.

There exist solutions for non-definitive attachment of the coating,either by using double sided adhesive strips or by using a fixing agentconsisting of a self-adhesive. These solutions allow rapid renovation ofthe premises but they should be reserved for residential rooms with lowpassing frequency. Indeed, the resistance of the attachment and thedurability of the adhesive bonding are low. Further, the use of doublesided adhesive strips causes overthicknesses which may cause blistersupon displacements of furniture or generate the occurrence of traces onthe PVC (called phantoms).

In the case of an attachment by means of conventional adhesives which isthe common solution today, the replacement for renovation of a flexibleflooring stuck beforehand (for example a fitted carpet), involves asuccession of long and tedious steps before being able to restick a newcoating. The old coatings have to be suppressed by pulling them off in afirst phase, and then the adhesive residues have to be removed. One thenresorts either to manual tools (scrapers) or to the aid of a stripper ora paint stripper with a solvent.

In the case of irregularities, it should further be proceeded withsanding as well as with filling the floor with a leveling plaster coatbefore being able to apply a new adhesive layer for attaching the newcoating.

Further, some adhesive and potentially, residues of an inorganic bindersuch as a filler remain attached on the old coating, which is anobstacle to its recycling.

In the case of large surfaces such as commercial premises, thereplacement of the coating will require closing the premises for arelatively long time required for the whole of the renovation steps.

This problem is also again found for walls, with coatings of the glassfabric type.

Document DE 10 029 964 describes an adhesive in an aqueous dispersionfor flexible flooring, comprising a dispersion of acrylic polymers, atackifying resin and a mineral filler. With this composition it ispossible to cause easy breakage within the adhesive (cohesive failure)but this composition does not solve the problems related to the adhesiveresidues remaining on the substrate and which will have to be removed bymeans of a solvent or by particular mechanical tools. It does not eitherallow the recycling of the coating.

Document EP 0 911 463 describes a peelable coating comprising a durableupper layer and anti-adhesive sublayer (release coating). The durablelayer is a layer of the epoxy resin type, therefore a hard layer or ofthe polyurethane type. The release layer has greater adhesion on thedurable layer than on the support. Such layers are for example latexlayers. A barrier layer, e.g. based on wax, may also be provided insteadand in place of the latex anti-adhesive layer.

Document U.S. Pat. No. 4,824,498 describes a surface coating comprisinga succession of layers. A first non-peelable layer is attached onto thefloor, a second peelable layer is applied onto the first layer and thena non-peelable cell layer is applied, finally the surface coating,generally a fitted carpet, is stuck onto the cell layer. This surfacecoating does not solve the problems related to the adhesive residuesremaining on the substrate and does not either allow recycling of thecoating.

Therefore to this day, there does no exist any simple, resistant,adhesive bonding solution and in particular a solution suitable forpremises with a lot of traffic, which may subsequently be easily removedand rapidly in order to find again the original substrate for renovationon the one hand and optionally the original flexible coating forrecycling on the other hand.

BRIEF DESCRIPTION OF THE INVENTION

The object of the present invention is to provide an adhesivecomposition overcoming at least partly the aforementioned drawbacks.

For this purpose, the present invention proposes an adhesive compositioncomprising:

-   -   from 10% to 40% by weight of at least one natural latex,    -   from 10% to 40% by weight of dry material based on the total        weight of the adhesive composition, of at least one polymeric        composition having a glass transition temperature ranging from        −50° C. to 0° C., said polymeric composition comprising:        -   at least one copolymer or one mixture of at least two            polymers comprising at least one (meth)acrylate or            (meth)acrylic monomer, and/or        -   at least one mixture of at least two polymers comprising at            least one polyester and at least one polyurethane, and/or        -   at least one copolymer of vinyl acetate and of ethylene.

According to an embodiment of the invention, the adhesive compositionfurther comprises from 10% to 40% by weight of at least one fillerhaving an apparent density ranging from 1.30 to 1.70.

According to an embodiment of the invention, the natural latexrepresents from 15% to 35%, preferably from 20% to 30% by weight of thetotal weight of the adhesive composition.

According to an embodiment of the invention, the polymeric compositionrepresents from 10% to 25%, preferably from 12% to 20% by weight of drymaterial based on the total weight of the adhesive composition.

According to an embodiment of the invention, the filler(s) represent(s)from 15% to 35%, preferably from 20% to 30% by weight of the totalweight of the composition.

According to an embodiment of the invention, the adhesive compositionfurther comprises up to 10% by weight of a tackifying resin, preferablyselected from rosin esters, terpene resins, terpene-phenol resins,dispersions based on terpene-phenol resin.

Preferably, the natural latex is a natural latex having an ammoniacontent ranging from 0.2 to 1% by weight based on the weight of naturallatex.

According to an embodiment, the filler is a mineral filler, preferablyselected from calcium carbonate, magnesium carbonate, sand, alumina,hydrated alumina, magnesium silicate, aluminium silicate, sodiumsilicate, potassium silicate, mica and silica.

Preferably, the polymeric composition has a glass transition temperatureranging from −40° C. to −10° C., preferably from −37° C. to −15° C.

According to an embodiment of the invention, the copolymer is aterpolymer of vinyl acetate, of ethylene and of acrylate.

According to an embodiment, the polymeric composition comprises aterpolymer of vinyl acetate, of ethylene and of acrylate and a mixtureof a polyester and of a polyurethane.

According to an embodiment of the invention, the adhesive compositionfurther comprises fibers, preferably cellulose or glass fibers ornatural fibers, such as cotton, jute, viscose, sisal, or syntheticfibers, such as polyamide, polyester, polyacrylonitrile, polypropylene,polyethylene, or rubber fibers.

The invention also relates to a membrane obtained by drying the adhesivecomposition according to the invention.

The invention also relates to the combination of a flexible surfacecoating with an adhesive composition according to the invention.

The invention also relates to a method for applying a flexible surfacecoating on a substrate comprising the following steps:

-   -   a) applying an adhesive composition layer according to the        invention onto a substrate,    -   b) displaying the flexible coating on the substrate,

Preferably, the amount of applied adhesive composition is greater thanor equal to 200 g/m², preferably greater than or equal to 250 g/m²,still preferably greater than or equal to 300 g/m², more particularlygreater than or equal to 350 g/m².

According to an embodiment of the invention, the application methodaccording to the invention comprises before step a), a step for applyinga weft or a non-woven reinforcing strip onto the substrate.

Preferably, the weft is selected from a grid, a woven or non-wovenmaterial.

According to an embodiment of the invention, the application methodcomprises between steps a) and b), an additional step for drying theadhesive composition so as to obtain a membrane, followed by theapplication of an adhesive composition, different from that of theinvention, onto the thereby obtained membrane.

According to an embodiment of the invention, the application methodcomprises a subsequent step for smoothing the adhesive composition underthe flexible surface coating.

The invention also relates to a substrate coated with a peelableadhesive membrane and with a flexible surface coating.

Preferably, the peelable adhesive membrane has a thickness greater thanor equal to 100 μm, preferably greater than or equal to 125 μm, moreparticularly greater than or equal to 150 μm.

According to an embodiment of the invention, the peelable adhesivemembrane has a thickness of less than or equal to 1 millimeter.

The invention also relates to a method for renovation of a substrateaccording to the invention comprising a step for pulling off theflexible surface coating.

According to an embodiment of the invention, the renovation methodcomprises an additional step for recycling the flexible surface coating.

The advantages of the present invention are the following:

-   -   The composition of the invention is an adhesive bonding        composition which after drying forms a film, also called a        membrane, which is peelable. With a single composition, it is        therefore possible to ensure adhesive bonding and subsequent        detachment of the coating,    -   the composition of the invention after drying allows easy        separation of the flexible coating from the substrate, while        leaving the support and the coating intact with practically no        adhesive residue,    -   the adhesive composition of the invention provides long-lasting        adhesive bonding suitable for premises with strong traffic,    -   the adhesive composition of the invention is also well adapted        to application onto floors as well as to walls,    -   the method for applying the surface coating of the invention is        simple to apply since it only requires the application of a        single adhesive layer,    -   the method for adhesive bonding of the surface coating according        to the invention does not require the use of several coatings,        one of which would remain to the floor on a long term basis,    -   the adhesive bonding method of the invention allows adhesion of        all types of coatings, even those requiring the use of a strong        adhesive, while allowing a floor to be preserved without any        adhesive residue upon removing the coating,    -   the coating and the peelable adhesive of the invention may be        removed manually, without requiring the use of tools of the        scraper type. The film stemming from the drying of the adhesive        composition may be removed from the substrate or from the        coating without using any chemical products and without having        to resort to particular mechanical tooling,    -   with the invention, it is possible to recycle the coating, after        detachment and withdrawal of the peelable film, the latter being        without any adhesive residue.

Other features and advantages of the invention will become apparent onreading the description which follows, of a preferred embodiment of theinvention, given as an example and with reference to the appendeddrawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram illustrating an embodiment of the invention afterapplication of the peelable adhesive (1) and of the flexible coating (2)on a substrate (3).

FIG. 2 is a diagram illustrating the condition of the substrate (3) andof the flexible coating (2) after renovation.

FIGS. 3A-3E are diagrams illustrating methods for adhesive bonding of aflexible coating (2) involving a weft or a non-woven reinforcing strip(5).

FIGS. 4A-4D are diagrams illustrating methods for adhesive bonding of aflexible coating (2) in which a conventional adhesive (7) is applied onthe adhesive membrane (1).

DETAILED DESCRIPTION OF THE INVENTION

The present invention proposes a peelable adhesive compositioncomprising:

-   -   from 10% to 40% by weight of at least one natural latex, and    -   from 10 to 40% by weight of dry material based on the total        weight of the adhesive composition, of at least one polymeric        composition having a glass transition temperature ranging from        −50° C. to 0° C., said polymeric composition comprising:        -   at least one copolymer or one mixture of at least two            polymers comprising at least one (meth)acrylate or            (meth)acrylic monomer, and/or        -   at least one mixture of at least two polymers comprising at            least one polyester and at least one polyurethane, and/or        -   at least one copolymer of vinyl acetate and of ethylene.

According to an embodiment of the invention, the adhesive compositionaccording to the invention further comprises from 10% to 40% by weightof at least one filler having an apparent density ranging from 1.30 to1.70.

By peelable adhesive composition is meant an adhesive composition whichafter application on a substrate and drying forms a film or membrane,which may easily be removed without leaving any residues.

According to the present invention, the natural latex may be a naturallatex of a standard grade, a natural latex having a low ammonia content,a natural latex having a strong ammonia content. Generally, waterrepresents from 30% to 45% of the natural latex weight, typically 38.5%of the natural latex weight. Preferably, the natural latex is a naturallatex having an ammonia content ranging from 0.2 to 1% by weight basedon the weight of natural latex. A natural latex may be selected, havinga low ammonia content, i.e. generally ranging from 0.2% to 0.4%,typically 0.29% by weight based on the natural latex weight, or else anatural latex having a strong ammonia content, i.e. generally rangingfrom 0.5 to 1% by weight based on the weight of natural latex. It iswell known to one skilled in the art that ammonia allows stabilizationof natural latex.

The copolymers or the polymers used in the invention for forming thepolymeric composition, may be in the form of an aqueous emulsion or inthe form of a redispersible powder, which, after adding water, forms anaqueous solution. The form in which the copolymer or the mixture ofpolymers is used depends on its solubility in water.

The apparent density is measured by conventional methods well known toone skilled in the art, for example by weighing a determined volume asdescribed in the experimental part of the present invention. Theapparent density is defined by the ratio between the mass of thematerial and the apparent volume of the whole of the grains.

The presence of the filler allows control and enlargement of thethickness of the peelable adhesive film without increasing its cost. Alarger thickness increases the cohesion of the film and facilitates itsremoval after drying.

According to an embodiment of the present invention, the filler is amineral filler. Preferably, the filler is selected from calciumcarbonate, magnesium carbonate, sand, alumina, hydrated alumina,magnesium silicate, aluminium silicate, sodium silicate, potassiumsilicate, mica and silica. More particularly, the filler is selectedfrom calcium carbonate and sand.

It is also possible to contemplate the use of one or several organicfillers alone or in correlation with one or several mineral fillers.

According to an embodiment, natural latex represents from 15% to 35% byweight of the total weight of the adhesive composition, preferably from20% to 30% by weight of the total weight of the adhesive composition.

According to an embodiment, the polymeric composition represents from10% to 25% by weight, of dry material based on the total weight of theadhesive composition, preferably from 12% to 20% by weight of drymaterial based on the total weight of the adhesive composition.

According to an embodiment, the ratio (m/m) between the mass of naturallatex (wet mass) and the polymeric composition mass (dry material)ranges from 0.5 to 5, preferably from 1.2 to 2.5, is typically equal toabout 2.

According to an embodiment, the filler(s) represent(s) from 15 to 35% byweight of the total weight of the adhesive composition, preferably from20% to 30% by weight of the total weight of the adhesive composition.

In the adhesive composition, water is brought by the natural latex,through the aqueous emulsion of copolymer or of a mixture of polymersand with optional addition of water. Indeed, depending on the dilutionof the copolymer or of the mixture of polymers, one may be lead toadding water for obtaining the desired active material concentration.

According to an embodiment, water represents from 20% to 60% by weightof the total weight of the adhesive composition, preferably from 20% to50% by weight of the total weight of the adhesive composition.

According to an embodiment of the invention, the peelable adhesivecomposition comprises one or several other additives selected from: athickener, a biocide, an anti-foam agent, a natural latex stabilizer, anodor-masking agent, a pH-adjusting agent and/or an antioxidant.

The thickener notably gives the possiblity of maintaining the filler(s)in suspension.

Preferably, the thickener is an aqueous solution of sodium polyacrylateor an aqueous solution of polyurethane. Generally, the thickener has aglass transition temperature of the order of 200° C., much higher thanthe glass transition temperatures of the copolymers or of the mixturesof polymers as defined earlier.

Preferably, the thickener represents from 0.2 to 5%, preferably from0.5% to 5% by weight of the total weight of the adhesive composition.

Preferably, the other additives represent from 0.5% to 5% by weight ofthe total weight of the adhesive composition.

Preferably, the polymeric composition has a glass transition temperature(Tg) ranging from −40° C. to −10° C., more particularly from −37° C. to−15° C. In a conventional way, well known to one skilled in the art, theglass transition temperature may be measured by DSC (DifferentialScanning calorimetry).

By copolymer, comprising at least one (meth)acrylate or (meth)acrylicmonomer, is meant a polymer formed from at least two monomers, includinga (meth)acrylate or (meth)acrylic monomer.

By mixture of polymers comprising at least one (meth)acrylate or(meth)acrylic monomer, is meant a mixture comprising at least twopolymers, at least one polymer of which is formed from (meth)acrylate or(meth)acrylic monomers.

According to an embodiment, the (meth)acrylate or (meth)acrylic monomeris selected from acrylic acid, methacrylic acid, methyl acrylate, methylmethacrylate, ethyl acrylate, ethyl methacrylate, butyl acrylate, butylmethacrylate, isobutyl acrylate, isobutyl methacrylate, n-hexylacrylate, n-hexyl methacrylate, ethylhexyl acrylate, ethylhexylmethacrylate, n-heptyl acrylate, n-heptyl methacryalte, stearylacrylate, stearyl methacrylate, glycidyl methacrylate, acrylamide,methacrylamide, hydroxethyl acrylate, hydroxyethyl methacrylate, allylmethacrylate, cyclohexyl acrylate, cyclohexyl methacrylate,2-ethoxyethyl-acrylate, 2-ethoxyethyl-methacrylate, isodecyl acrylate,isodecyl methacrylate, 2-methoxy acrylate, 2-ethoxy-methacrylate,2-(2-ethoxyethoxy)-ethyl acrylate, 2-phenoxyethyl acrylate,2-phenoxyethyl methacrylate, isobornyl acrylate, isobornyl methacrylate,caprolactone acrylate, caprolactone methacrylate, polypropylene glycolmonoacrylate, polypropylene glycol monomethacrylate, polyethylene glycolacrylate, polyethylene methacrylate, benzyl acrylate, benzylmethacrylate.

According to a particular embodiment of the invention, the polymericcomposition having a glass transition temperature ranging from −50° C.to 0° C., comprises at least one copolymer or one mixture of at leasttwo polymers comprising at least one (meth)acrylate or (meth)acrylicmonomer.

According to a particular embodiment of the invention, the polymericcomposition having a glass transition temperature ranging from −50° C.to 0° C., essentially consists in one or several copolymers or a mixtureof at least two polymers comprising at least one (meth)acrylate or(meth)acrylic monomer.

According to an embodiment, the copolymer or the mixture of polymerscomprising at least one (meth)acrylate or (meth)acrylic monomercomprises one or several other monomers selected from vinyl acetate,ethylene, styrene, vinyl chloride, vinyl versatate and vinyl laurate.

According to an embodiment, the copolymer comprising at least one(meth)acrylate or (meth)acrylic monomer is a terpolymer of vinylacetate, of ethylene and of acrylate.

According to an embodiment of the invention, the polymeric compositionhaving a glass transition temperature ranging from −50° C. to 0° C.comprises at least one mixture of two polymers comprising at least onepolyester and at least one polyurethane.

Preferably, the polymeric composition essentially consists in a mixtureof polyesters and of polyurethanes.

According to an embodiment, the polyurethanes are obtained from at leastone polyol and at least one polyisocyanate.

Advantageously, the polyols are selected from ethylene glycol,1,2-propylene glycol, 1,3-propylene glycol, 1,4-butanediol,1,3-butanediol, 1,4-butenediol, 1,4-butynediol, 1,5-pentanediol,1,6-hexanediol, 1,8-octanediol, neopentylglycol, cyclohexanedimethanol,2-methyl-1,3-propanediol, 1,5-pentanediol, diethylene glycol,triethylene glycol, tetraethylene glycol, polyethylene glycol,dipropylene glycol, polypropylene glycol, dibutylene glycol andpolybutylene glycol.

Preferably, the polyisocyanates are selected from linear or brancheddiisocyanates comprising an alkylene chain from 4 to 14 carbon atoms,cycloaliphatic diisocyanates comprising from 6 to 12 carbon atoms,aromatic diisocyanates comprising from 8 to 14 carbon atoms,polyisocyanates comprising isocyanurates, uretdione diisocyanates,diisocyanates comprising biurets, polyisocyanates comprising urethaneand/or allophanate groups, polyisocyanates comprising oxadiazinetrionegroups, uretonimine-modified polyisocyanates or mixtures thereof.

According to an embodiment, the diisocyanates are selected fromtetramethylene diisocyanate, hexamethylene diisocyanate, octamethylenediisocyanate, decamethylene diisocyanate, dodecamethylene diisocyanate,tetradecamethylene diisocyanate, trimethylhexane diisocyanate,tetramethylhexane diisocyanate, 1,4-diisocyanatocyclohexane,1,3-diisocyanatocyclohexane, 1,2-diisocyanato-cyclohexane,4,4′-di(isocyanatocyclohexyl)methane, 1,4-diisocyanatocyclohexene,1,3-diisocyanatocyclohexene, 1,2-diisocyanatocyclohexene, isophoronediisocyanate (IPDI), 2,4-diisocyanato-1-methylcyclohexane,2,6-diisocyanato-1-methyl-cyclohexane, 2,4-diisocyanatotoluene,2,6-diisocyanatotoluene, tetramethylxylylene diisocyanate,1,4-diisocyanatobenzene, 4,4′-diisocyanatodiphenylmethane,2,4-diisocyanatodiphenylmethane, p-xylylene diisocyanate andisopropenyl-dimethyltolylene diisocyanate.

According to an embodiment, the polyesters are selected from polyolpolyesters. Preferably, the polyesters are obtained from polycarboxylicacids and/or polycarboxylic anhydrides and/or polycarboxylates andpolyols.

The polycarboxylic acids may be aliphatic, cycloaliphatic, aromatic orheterocyclic, they may be non-substituted or substituted, for examplewith a halogen, and they may be saturated or unsaturated.

According to an embodiment, the polycarboxylic acids, the polycarboxylicanhydrides are selected from succinic acid, adipic acid, suberic acid,azelaic acid, sebacic acid, phthalic acid, isophthalic acid, phthalicanhydride, tetrahydrophthalic anhydride, hexahydrophthalic anhydride,tetrachlorophthalic anhydride, endomethylenetetrahydrophtalic anhydride,glutaric anhydride, maleic acid, maleic anhydride, fumaric acid.

Among the polyols which may be used for making the polyester, mentionmay be made of ethylene glycol, 1,2-propylene glycol, 1,3-propyleneglycol, 1,4-butanediol, 1,3-butanediol, 1,4-butenediol, 1,4-butynediol,1,5-pentanediol, 1,6-hexanediol, 1,8-octanediol, neopentylglycol,cyclohexanedimethanol, 2-methyl-1,3-propanediol, 1,5-pentanediol,diethylene glycol, triethylene glycol, tetraethylene glycol,polyethylene glycol, dipropylene glycol, polypropylene glycol,dibutylene glycol and polybutylene glycol.

According to an embodiment of the invention, the polymeric compositionhaving a glass transition temperature ranging from −50° C. to 0° C.comprises at least one copolymer of vinyl acetate and of ethylene.

According to an embodiment of the invention, the polymeric compositionhaving a glass transition temperature ranging from −50° C. to 0° C.comprises a mixture:

-   -   of at least one copolymer or one mixture of at least two        polymers comprising at least one (meth)acrylate or (meth)acrylic        monomer as defined above, and    -   of at least one mixture of at least two polymers comprising at        least one polyester and at least one polyurethane as defined        above.

According to an embodiment of the invention, the polymeric compositionhaving a glass transition temperature ranging from −50° C. to 0° C.essentially consists in a mixture:

-   -   of one or several copolymers or a mixture of at least two        polymers comprising at least one (meth)acrylate or (meth)acrylic        monomer as defined above, and    -   a mixture of at least one polyester and of at least one        polyurethane as defined above.

According to an embodiment, the fillers have an apparent density rangingfrom 1.30 to 1.70, preferably from 1.40 to 1.60.

Preferably, the filler has a grain size ranging from 10 to 400 μm.

One skilled in the art may adjust the proportions and the selection ofthe monomers so as to obtain a copolymer or a mixture of polymers havingthe desired glass transition temperature.

The emulsions of (co) polymer(s) which may be used for preparing theadhesive composition of the invention are commercially available.Mention may be made of the following products:

-   -   PLEXTOL® D 306 (available from Synthomer): aqueous dispersion of        pure acrylic resin based on n-butyl acrylate (98%) and on        styrene (2%) having a glass transition temperature of −30° C.,    -   VINNAPAS® EAF 68 (available from Wacker): aqueous dispersion of        acrylic resin based on vinyl acetate, ethylene and acrylate        having a glass transition temperature of −35° C.,    -   ACRONAL® A 380 (available from BASF): aqueous dispersion of        acrylic resin based on acrylate(s) and on acrylonitrile having a        glass transition temperature of −22° C.,    -   LUPHEN® D DS 3548 (available from BASF): a dispersion of a resin        based on ester and urethane having a glass transition        temperature of −46° C.,    -   VINNAPAS® EP 8010: an aqueous dispersion of resin based on vinyl        acetate (83%) and on ethylene (17%) having a glass transition        temperature of −10° C.

According to an embodiment of the invention, the peelable adhesivecomposition further comprises fibers, such as cellulose fibers, glassfibers, rubber fibers, natural fibers such as cotton, viscose, jute,sisal or synthetic fibers, such as polyamide, polyester,polyacrylonitrile, polypropylene, polyethylene fibers. Preferably thefibers represent from 0.01 to 2% by weight based on the weight of thepeelable adhesive composition.

The fibers give the possibility after drying the composition ofincreasing the cohesion of the thereby obtained membrane (or film).

According to an embodiment of the invention, the adhesive compositionfurther comprises up to 10% by weight of a tackifying resin, preferablyselected from rosin esters, terpene resins, terpene phenol resins anddispersions based on terpene phenol resin.

The tackifying resin allows an improvement in the trapping nature of theadhesive. With this it is possible to maintain the materials bettertogether as soon as they are assembled so that they do not slip and moverelatively to each other. Thus, the adhesive film remains continuous andimmobile during the setting time and the adhesive bonding does not open.

Another object of the present invention is a method for manufacturingthe peelable adhesive according to the invention. The peelable adhesiveis made by simply mixing the components. Preferably, the thickener isadded first, followed by the soda solution, and then the copolymer or amixture of polymers is added so as to avoid too large pH variations.After manufacture, the adhesive composition is stored away from lightand air at a temperature ranging from 5° C. to 40° C., preferably from10° C. to 30° C.

In the case when the copolymer of the mixture of polymers is in the formof a redispersible powder, the copolymer or the mixture of polymers isintegrated to the adhesive composition by an extra addition of water inorder to obtain an aqueous solution.

Another object of the present invention relates to a membrane obtainedby drying the peelable adhesive composition according to the invention.

Indeed, the peelable adhesive composition according to the invention maybe applied on a substrate, for example the floor, and then after dryingsaid adhesive composition, the latter forms a peelable membrane.

According to an embodiment, the peelable membrane has a thicknessgreater than or equal to 100 μm, preferably greater than or equal to 125μm, more particularly greater than or equal to 150 μm. One skilled inthe art knows how to adapt the maximum thickness according to theapplication conditions. Indeed, it is desirable not to have a too largethickness for a surface coating stuck on a substrate. More particularly,the thickness of the peelable membrane (or film) may be less than orequal to 1 millimeter.

According to an embodiment of the invention, the peelable membrane maybe obtained by applying the peelable adhesive composition according tothe invention on a weft or a non-woven reinforcing strip.

Preferably, the weft is in the form of a grid, of a woven or non-wovenmaterial.

The material forming the weft may be a metal, natural or syntheticfibers or a plastic or in the form of a non-woven reinforcing strip.

Mention may for example be made of a weft in glass fiber, in polyamide,a metal grid, a non-woven material obtained by melting of entangledpolypropylene fibers, a woven material of polyester.

According to an embodiment, a coating is directly applied on thepeelable membrane. In this case, the substrate and the coating may bedetached and may have after detachment, intact surfaces, i.e. withoutany adhesive residue after removing the coating.

In the case when a weft is used, the removal of the membrane from thecoating surface and from the surface of the substrate is facilitated.

According to an alternative of the invention, a conventional adhesive isapplied on a dry membrane as described above, for then applying acoating. In this case, during the removal of the coating, the substrateis found again intact, without any adhesive residue. This embodiment inparticular gives the possibility of sticking coatings which require astrong adhesive. Among these types of coatings, mention may be made ofthe coatings having a large dimensional variation like rubber or LVT(Luxury Vinyl Tile) strips and slabs. In this embodiment, the adhesivemembrane may either comprise a weft or not as described above.

Among conventional adhesives, mention may be made of acrylic or SBR(styrene-butadiene) dispersions or an adhesive of the resin-alcohol typeor a liquid adhesive or dry adhesives.

Another object of the present invention is the combination of a flexiblesurface coating with a peelable adhesive composition according to theinvention.

Indeed, it may make sense to associate within a kit intended forprofessionals or individuals, a flexible surface coating and an adhesivecomposition in amounts adapted to the surface to be coated.

A weft may also be part of the kit.

The kit may further comprise a conventional adhesive.

The flexible surface coatings used in the invention are those which meetthe conditions set out in the DTU 53.1 and 53.2 standards.

Notably, flexible coatings are knitted, tufted, woven and flocked fittedcarpets, in roll forms or as slabs, notably those which meet therequirements of NF EN 1307, as well as needled floorings in roll form oras slabs, notably those which meet the requirements of NF EN 1470 andprEN 13297. Mention may be made of conventional wool or synthetic fittedcarpets, and natural fiber coatings.

Flexible coatings may also be polymer floorings, for example in PVC orother polymer. Mention may be made of the following examples (see theDTU 53.2 standard):

-   -   Homogeneous and heterogeneous floorings based on polyvinyl        chloride    -   Floorings based on polyvinyl chloride on a jute or polyester        support or on a polyester support with a backside in polyvinyl        chloride    -   Floorings based on polyvinyl chloride on foam    -   Floorings based on polyvinyl chloride with a support based on        cork    -   Floorings based on expansed polyvinyl chloride    -   Semi-flexible slabs based on polyvinyl chloride    -   Slabs of cork agglomerate with a wear layer based on polyvinyl        chloride    -   Flexible coatings based on polymers of renewable origin (notably        of agricultural origin) such as PLA (polylactic acid) or        polyolefin polymers (the olefin notably stemming from        bio-ethanol)

A large number of different coatings may therefore be used in theinvention, for example the following coatings:

-   -   homogeneous PVCs (slabs or strips)    -   multilayer PVCs (slabs or strips)    -   PVCs on cork    -   Polyolefins    -   Linoleums in strips    -   Rubbers as slabs or as strips    -   Expanded relief vinyls (ERV)    -   Semi-flexible slabs    -   Needled fabrics with or without any backside    -   Fitted carpets on foam (latex)    -   Fitted carpets with non-woven backsides    -   Synthetic back fitted carpets (of the Action Back type)    -   Coconut, sisal and sea grass with latex backsides.

Another object of the invention relates to a method for applying aflexible surface coating on a substrate comprising the following steps:

-   -   a) applying a peelable adhesive composition layer according to        the invention onto the substrate,    -   b) displaying the flexible surface coating on the substrate.

The substrate on which the coating of the invention is applied is anytraditional support receiving this type of coating. Mention may forexample be made of surfaced concretes (notably with a treated siding),cement-based screeds (either incorporated or added), anhydrite screeds,old tilings, old suitably smoothed parquet flooring, particle panels orplywoods, standard wall claddings.

According to an embodiment of the invention, the amount of peelableadhesive composition is greater than or equal to 200 g/m², preferablygreater than or equal to 250 g/m², more preferably greater than or equalto 300 g/m², more particularly greater than or equal to 350 g/m².

The application of the peelable adhesive composition is either carriedout continuously or discontinuously on the substrate.

Preferably, the adhesive layer is directly applied on the substrate. Thesubstrate is not generally primarized before applying the adhesivelayer. For example tiling undergoes simple cleansing before applying theadhesive layer. The substrates are those mentioned in the DTU 53.1standard.

Conventionally, the flexible surface coating is laid after observance ofa gumming time ranging from 10 to 30 minutes. The gumming timecorresponds to the period during which the applied adhesive compositionthickens and increases its adhesive power.

Preferably, the application method of the invention has an additionalstep c) for smoothing the adhesive composition under the flexiblesurface coating in order to facilitate the transfer of the adhesive tothe back of the flexible coating. With this step, it is notably possibleto spread out the adhesive composition so as to make the appliedadhesive composition continuous or quasi-continuous on the substrate.

The user may lay the flexible coating within a time interval defined bythe working time which is of the order of 30 minutes and which may bemodulated by adding additives. The working time begins to elapse at theend of the gumming time and ends at the moment when the adhesive haslost its adhesivity.

After drying the adhesive composition, a film (also called membrane) ofpeelable adhesive is obtained.

According to an embodiment, the peelable adhesive film or membrane has athickness greater than or equal to 100 μm, preferably greater than orequal to 125 μm, more particularly greater than or equal to 150 μm. Oneskilled in the art knows how to adapt the maximum thickness according tothe application conditions. Indeed, it is desirable not to have a toolarge thickness for a surface coating stuck onto a substrate. Moreparticularly, the thickness of the peelable adhesive film may be lessthan or equal to 1 millimeter.

The invention preferentially applies to floorings, but also may beapplied on walls.

According to a particular embodiment of the method for applying aflexible surface coating according to the invention, a weft is depositedon the substrate before step a) for applying the peelable adhesivecomposition layer.

Preferably, the weft is in the form of a grid, of a woven or non-wovenmaterial or of a non-woven reinforcing strip.

The material making up the weft may be a metal, natural or syntheticfibers or a plastic.

For example, mention may be made of a weft in glass fiber, in polyamide,metal grid, a non-woven material obtained by melting entangledpolypropylene fibers, a woven polyester material.

FIG. 3 illustrates a particular embodiment of the invention. FIG. 3Aillustrates as a perspective the initial substrate 3. FIG. 3Billustrates as a perspective the substrate 3 on which a weft 5 isdeposited. FIG. 3C illustrates as a perspective the substrate 3 coveredby the weft 5 onto which the adhesive composition 1 is applied by meansof an applicator 6. FIG. 3D illustrates as a sectional view, thesubstrate 3 covered with the adhesive composition 1. The weft 5 is thenimpregnated with the adhesive composition 1. And then, a flexiblecoating 2 is applied on the adhesive composition 1 comprising the weft5, as illustrated in FIG. 3E.

According to an alternative of the method according to the invention,the method for applying a flexible surface coating comprises betweensteps a) and b), the following additional steps:

-   -   Abis) drying the adhesive composition for obtaining a membrane,    -   Ater) application of a conventional adhesive on the membrane        obtained at the end of step Abis.

Preferably, the application of the conventional adhesive in step Ater)is carried out after a drying time in step Abis) comprised between 20and 80 minutes.

FIG. 4 illustrates an embodiment of the invention involving aconventional adhesive 7.

FIG. 4A illustrates as a perspective view, the substrate 3 coated withan adhesive membrane 1. FIG. 4B illustrates as a perspective view, thesubstrate 3 coated with a dry adhesive membrane 1 onto which aconventional adhesive composition 7 is applied by means of an applicator6. FIG. 4C illustrates as a sectional view the substrate 3 covered withan adhesive membrane according to the invention and with a conventionaladhesive composition layer 7. Next, a flexible coating 2 is applied onthe conventional adhesive composition 7, as illustrated in FIG. 4D.

According to an alternative of the invention, the adhesive membrane 1may comprise a weft, not illustrated in FIGS. 4A to 4D, as describedabove.

According to an embodiment of the invention, the conventional adhesiveis selected from acrylic or SBR (styrene-butadiene) dispersions oradhesives of the resin-alcohol type or liquid adhesives or dryadhesives.

Another object of the present invention is a substrate coated with apeelable film according to the invention and with the flexible surfacecoating.

FIG. 1 illustrates the flexible coating 2 adhered on a substrate 3 bymeans of the peelable adhesive 1 according to the invention.

Another object of the present invention is a method for renovation of asubstrate including a surface coating, this method comprising a step forpulling off a flexible coating according to the invention.

The pulling-off step is carried out by exerting a peeling force on thecoating so as to remove easily the layer formed by the peelable adhesivefilm at the peelable film/substrate and peelable film/flexible coatinginterface, leaving the substrate and the flexible facing as they werebefore the adhesive bonding.

In the case when a conventional adhesive is applied between the coatingand the peelable membrane according to the invention, then only thesubstrate is again found as it was before the adhesive bonding, at theend of the step for pulling off the flexible coating.

The renovation method according to an embodiment of the invention givesthe possibility of obtaining a substrate and a flexible coating, bothwithout any adhesive residues (FIG. 2). The failure, schematized in FIG.2 by the lines 4, is adhesive.

According to an embodiment of the invention, the renovation methodcomprises an additional step for recycling the flexible coating.

After pulling off the flexible coating, the substrate may immediately becovered with a new coating and the coating may be recycled.

EXAMPLES

Different adhesive compositions were prepared and the performances ofthese compositions were tested.

The compositions A, B, C, D and E are comparative examples and are notpart of the invention.

Compositions 1 to 15 are peelable adhesive compositions according to theinvention.

The following copolymers were used:

-   -   PLEXTOL® D306: Aqueous dispersion of pure acrylic acid based on        n-butyl acrylate (98%) and on styrene (2%) with Tg=−30° C.,    -   VINNAPAS® EAF 68: Aqueous dispersion of acrylic resin based on        vinyl acetate, ethylene and acrylate with Tg=−35° C.,    -   ACRONAL® A380: Aqueous dispersion of acrylic resin based on        acrylate(s) and on acrylonitrile with Tg=−22° C.,    -   VINNAPAS® EP34: Aqueous dispersion of resin based on vinyl        acetate (87%) and on ethylene (13%) with Tg=3° C.,    -   LUPHEN® D DS 3548 (available from BASF): dispersion of a resin        based on ester and urethane having a glass transition        temperature of −46° C.,    -   VINNAPAS® EP 8010: Aqueous dispersion of resin based on vinyl        acetate (83%) and on ethylene (17%) with Tg=−10° C.

The tackifying resin which was used for making the compositions 10 and11 is a tackifying resin of the modified rosin type, esterified withtriethylene glycol available from DRT under the designation GRANOLITE®150 N.

The apparent density of the fillers was measured according to thefollowing operating method:

-   -   a calibrated cup with a capacity of about V=500 mL (mass of the        cup Mo=500 g) is placed in an upright position below a funnel in        stainless steel with a capacity of about 600 mL;    -   the hollow bottom of the funnel is closed with a slider, the        slider giving the possibility of ensuring the opening and the        closing of the hollow bottom of the funnel;    -   the funnel is filled completely with the homogenized filler(s),        and the slider is rapidly removed, thereby letting the filler(s)        flow into the cup;    -   the excess fillers are slowly leveled by means of a flat ruler        (an equivalent instrument may be suitable), and the outside of        the cup is carefully cleaned with a dry cloth (a brush may be        used),    -   the cup is laid on analytical scales to within 0.1 g and the cup        and its contents mass M1 are weighed with an accuracy of 0.1 g.

The apparent density is then calculated as being: d=(M1−Mo)/V. In thisformula M1 and Mo are expressed in grams, the volume is expressed incm³.

TABLE 1 Compositions Composition (% by weight) A B C D E 1 2 3 4 5 6 7 89 PLEXTOL ® D306 (% by dry 60 — — — — — — — — — — — — 30 weight)VINNAPAS ® EAF 68 (% by dry — — — 6 19.3 15 15 15 15 15 30 30 — —weight) ACRONAL ® A380 (% by dry — — — — — — — — — — — — 15 — weight)VINNAPAS ® EP34 (% by dry — — 15 — — — — — — — — — — — weight) Naturallatex (% by wet weight) — 58.8 30 39 38.68 30.34 30 30 30 30 15 15 30 15Water 40 39.2 30 30 38.64 30.22 30 30 30 30 30 30 30 30 CaCO₃ 12 μm — —— — — 21.7 — 5.32 10.75 16.18 — — — — CaCO₃ 350 μm — — 21.5 21.5 — —21.5 16.18 10.75 5.32 21.5 — 21.5 21.5 SBLS sand 120 μm — — — — — — — —— — — 21.5 — — Apparent density of the fillers — — 1.7 1.7 — 1.3 1.7 1.61.5 1.4 1.7 1.35 1.7 1.7 Thickener: sodium polyacrylate — 2  1.37 1.371.6 1.13 1.37 1.37 1.37 1.37 1.37 1.37 1.37 1.37 aqueous solutionBiocide — — 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15Anti-foam agent — — 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2Stabilizer of the latex — — 1.16 1.16 1.16 1.16 1.16 1.16 1.16 1.16 1.161.16 1.16 1.16 Odor-masking agent — — 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.10.1 0.1 0.1 0.1 pH adjusting agent — — 0.17 0.17 0.17 — 0.17 0.17 0.170.17 0.17 0.17 0.17 0.17 Anti-oxidant — — 0.35 0.35 — — 0.35 0.35 0.350.35 0.35 0.35 0.35 0.35

TABLE 1bis Compositions 10 to 15 Composition (% by weight) 10 11 12 1314 15 VINNAPAS ® EAF 68 11 12.5 9 4 (% by dry weight) LUPHEN ® D DS 35485 10 14 (% by dry weight) VINNAPAS ® EP 8010 15 (% by dry weight)Natural latex (% by wet 29 30 30 30 30 30 weight) Water 26 27.5 30 30 3030 CaCO₃ 350 μm 21 21.15 20.85 20.85 20.85 21.5 Granolite ® 150 N 7.653.65 Apparent density of the 1.7 1.7 1.7 1.7 1.7 1.7 fillers Thickener:aqueous 1.02 1.37 1.37 1.37 1.6 1.37 solution of sodium polyacrylateBiocide 0.15 0.15 0.15 0.15 0.15 0.15 Anti-foaming agent 0.2 0.2 0.2 0.20.2 0.2 Stabilizer with latex 1.66 0.16 1.16 1.16 1.66 1.16 Odor-maskingagent 0.1 0.1 0.1 0.1 0.1 0.1 pH adjusting agent 0.17 0.17 0.17 0.170.17 0.17 Anti-oxidant 0.35 0.35 0.35 0.35 — 0.35Efficiency of the Adhesive Bonding and of the Detachment

The efficiencies of the adhesive bonding and detachment were evaluatedby applying a peelable adhesive layer with a base weight of 360 g/m².

The efficiency of the adhesive bonding and of the detachment isevaluated on a substrate of the smoothing coating type with a coating ofpolyvinyl chloride (PVC), 7 days after being laid, the coating ismanually removed and the force required for detaching the coating andthe facility of detaching the adhesive film are evaluated qualitatively.

The results are indicated in Tables 2 and 2bis.

TABLE 2 Efficiency of adhesive bonding and of the detachment A B C D 1 23 4 5 6 Efficiency good does excellent does good good good good goodexcellent of the not not bonding adhere adhere Efficiency non- very Non-excellent good excellent good good good medium of the detachable gooddetachable detachment

TABLE 2bis Efficiency of the adhesive bonding and of the detachment 7 89 10 11 12 13 14 15 Efficiency medium excellent medium good good goodgood excellent good of the bonding Efficiency good medium medium goodexcellent excellent good Medium good of the detachment

The comparative compositions A, B, C and D do not have togethercapabilities of adhesive bonding and detachment.

The compositions 1 to 15 according to the invention have togethercapabilities of adhesive bonding and detachment.

Peeling Force

The peeling force required for initiating the removal of the PVC coatingbound by the peelable adhesive layer to a substrate consisting of afiber-cement plate, is measured. The standard NF EN 1372 (peeling at90°) is applied with a specimen of 250×50 mm, a peeling rate of 100mm/min, and conditioning for 7 days at 23° C./50% RH.

The peeling force allows quantitative determination of the efficiency ofthe adhesive bonding.

The results are shown in Table 3 and 3bis.

Shearing Resistance of a Stuck Coating

The shearing resistance of a coating stuck on a fiber-cement plate isnow determined. It is proceeded according to the standard NF EN 1373 (aspecimen of 60×50 mm, a traction rate of 20 mm/min, and conditioning for7 days at 23° C./50% RH), with an application of 360 g/m² of peelableadhesive. A homogeneous PVC Taraflex surface is used.

The shearing resistance of a stuck coating allows quantitativedetermination of the efficiency of the adhesive bonding.

The results are shown in Table 3 and 3bis.

TABLE 3 Peeling force and shearing resistance of the compositions C D 12 3 4 5 6 Peeling 1.12 0.31 1 0.99 0.99 0.96 1.01 1.76 force (N/mm)Shearing 0.28 0.25 0.41 0.34 0.34 0.43 0.4 0.35 resistance (N/mm²)

TABLE 3bis Peeling force and shearing resistance of the compositions 7 89 10 11 12 13 14 15 Peeling 0.67 1.41 0.67 0.88 0.83 0.81 0.92 1.02 0.76force (N/mm) Shearing 0.39 0.37 0.33 0.34 0.31 0.35 0.43 0.54 0.31resistance (N/mm²)Characterization of the Adhesive

The characteristics of the adhesive are measured. The standard NF ISO 37is applied. The length of the sample is 70 mm and the width 6 mm, thefilm has a thickness ranging from 0.5 mm to 0.7 mm, the traction rate is50 mm/min.

The results are shown in Tables 4 and 4bis wherein Rm represents therupture stress and the modulus is the elastic modulus.

TABLE 4 Characterization of the adhesive C D 2 3 4 5 6 Rm (N/mm) 0.680.39 1.03 0.7 0.88 0.85 0.29 Elongation 900 1050 2500 2100 2250 22001750 at break (%) Modulus 0.83 0.42 0.4 0.2 0.25 0.28 0.3 (N/mm²)

TABLE 4bis Characterization of the adhesive 7 8 9 10 11 12 13 14 15 Rm(N/mm) 0.92 0.78 0.59 0.71 0.79 0.83 1.12 3.42 0.76 Elongation 2260 19501605 2250 2200 2250 2280 1800 2060 at break (%) Modulus 0.33 0.46 0.190.3 0.33 0.43 0.52 2.97 0.31 (N/mm²)Effect of the Thickness of the Dry Film and of the Filler

TABLE 5 Effect of the thickness of the dry film and of the filler E 2 4CaCO₃ 12 μm 0 0 10.75% CaCO₃ 350 μm 0 21.5% 10.75% Thickness of the dryfilm 50 μm 226 μm 173 μm Efficiency of the peeling medium excellent good

Table 5 shows the effect of the thickness of the dry film on theefficiency of the peeling. Indeed, a larger thickness allows improvementin the efficiency of the peeling (Examples 2 and 4).

Table 5 also shows the effect of the fillers on the efficiency of thepeeling. Indeed, the fillers allow an increase in the thickness of thedry film and therefore in the efficiency of the peeling (Example E ascompared with Examples 2 and 4).

Without further elaboration, it is believed that one skilled in the artcan, using the preceding description, utilize the present invention toits fullest extent. The preceding preferred specific embodiments are,therefore, to be construed as merely illustrative, and not limitative ofthe remainder of the disclosure in any way whatsoever.

In the foregoing and in the examples, all temperatures are set forthuncorrected in degrees Celsius and, all parts and percentages are byweight, unless otherwise indicated.

The entire disclosures of all applications, patents and publications,cited herein and of corresponding French application No. 1162448, filed26 Dec. 2011, are incorporated by reference herein.

The preceding examples can be repeated with similar success bysubstituting the generically or specifically described reactants and/oroperating conditions of this invention for those used in the precedingexamples.

From the foregoing description, one skilled in the art can easilyascertain the essential characteristics of this invention and, withoutdeparting from the spirit and scope thereof, can make various changesand modifications of the invention to adapt it to various usages andconditions.

The invention claimed is:
 1. A method for applying a flexible surfacecoating on a substrate consisting of the successive steps: a) applying apeelable adhesive composition layer on a surface of the substrate, b)observing a gumming time ranging from 10 to 30 minutes c) displaying aflexible surface coating on the substrate by contacting the flexiblesurface coating with the adhesive layer on the surface of the substrate,wherein said adhesive composition comprises: i) from 10% to 40% byweight of at least one natural latex, ii) from 10% to 40% by weight ofdry material based on the total weight of the adhesive composition, ofat least one polymeric composition having a glass transition temperatureranging from −50° C. to 0° C., said polymeric composition comprising:(1) a terpolymer of vinyl acetate, of ethylene and of acrylate and amixture of polyester and polyurethane, and/or (2) a terpolymer of vinylacetate, of ethylene and of acrylate iii) from 10% to 40% by weightbased on the total weight of the adhesive composition, of at least onefiller having an apparent density ranging from 1.30 to 1.70, wherein theamount of applied adhesive composition is greater than or equal to 200g/m², and wherein said substrate and said flexible surface coating,after pulling off, are both capable of being recovered without anyadhesive residues after removal of the peelable film or membraneobtained after drying of the peelable adhesive composition.
 2. A methodfor renovation of a substrate coated with a peelable adhesive filmcomprising: drying the adhesive composition of claim 1, and pulling offthe adhesive composition from a surface.
 3. The method of claim 1,wherein: i) the natural latex represents from 15% to 35% by weight ofthe total weight of the adhesive composition and/or ii) the polymericcomposition represents from 10% to 25% by weight of dry material basedon the total weight of the adhesive composition, and/or iii) thefiller(s) represent(s) from 15% to 35% by weight of the total weight ofthe composition.
 4. The method of claim 1, wherein the adhesivecomposition further comprises up to 10% by weight of a tackifying resin.5. The method of claim 1, wherein the polymeric composition has a glasstransition temperature ranging from −40° C. to −10° C.
 6. The method ofclaim 1, wherein the adhesive composition further comprises fibers. 7.The method of claim 1 wherein the amount of applied adhesive compositionis greater than or equal to 250 g/m².
 8. The method of claim 1 whereinthe amount of applied adhesive composition is greater than or equal to300 g/m².
 9. The method of claim 1 wherein the amount of appliedadhesive composition is greater than or equal to 350 g/m².
 10. Themethod of claim 4 wherein tackifying resin is rosin esters, terpeneresins, terpene phenol resins or dispersions based on terpene phenolresin.
 11. The method of claim 5 wherein the polymeric composition has aglass transition temperature ranging from −37° C. to −15° C.
 12. Themethod of claim 6 wherein fibers are cellulose fibers, glass fibers,rubber fibers, natural fibers, viscose, jute, sisal or synthetic fibers.13. The method of claim 1, wherein the substrate is selected fromsurfaced concretes, cement-based screeds, anhydrite screeds, oldtilings, old suitably smoothed parquet flooring, particle panels orplywoods, standard wall claddings.
 14. A method for applying a flexiblesurface coating on a substrate consisting of the successive steps: a)applying a weft or a non-woven reinforcing strip onto the substrate b)applying a peelable adhesive composition layer on a surface of thesubstrate, c) observing a gumming time ranging from 10 to 30 minutes, d)displaying the flexible surface coating on the substrate by contactingthe flexible surface coating with the adhesive layer on the surface ofthe substrate, wherein said adhesive composition comprises: i) from 10%to 40% by weight of at least one natural latex, ii) from 10% to 40% byweight of dry material based on the total weight of the adhesivecomposition, of at least one polymeric composition having a glasstransition temperature ranging from −50° C. to 0° C., said polymericcomposition comprising: (1) a terpolymer of vinyl acetate, of ethyleneand of acrylate and a mixture of polyester and polyurethane, and/or (2)a terpolymer of vinyl acetate, of ethylene and of acrylate, iii) from10% to 40% by weight based on the total weight of the adhesivecomposition, of at least one filler having an apparent density rangingfrom 1.30 to 1.70, wherein the amount of applied adhesive composition isgreater than or equal to 200 g/m², and wherein said substrate and saidflexible surface coating, after pulling off, are both capable of beingrecovered without any adhesive residues after removal of the peelablefilm or membrane obtained after drying of the peelable adhesivecomposition.
 15. The method of claim 14, wherein the weft is a grid, awoven or non-woven material.
 16. A method for applying a flexiblesurface coating on a substrate consisting of the successive steps: a)applying a peelable adhesive composition layer on a surface of thesubstrate, b) observing a gumming time ranging from 10 to 30 minutes, c)displaying the flexible surface coating on the substrate by contactingthe flexible surface coating with the adhesive layer on the surface ofthe substrate, and d) smoothing the adhesive composition under theflexible surface coating, wherein said adhesive composition comprises:i) from 10% to 40% by weight of at least one natural latex, ii) from 10%to 40% by weight of dry material based on the total weight of theadhesive composition, of at least one polymeric composition having aglass transition temperature ranging from −50° C. to 0° C., saidpolymeric composition comprising: (1) a terpolymer of vinyl acetate, ofethylene and of acrylate and a mixture of polyester and polyurethane,and/or (2) a terpolymer of vinyl acetate, of ethylene and of acrylate,iii) from 10% to 40% by weight based on the total weight of the adhesivecomposition, of at least one filler having an apparent density rangingfrom 1.30 to 1.70, wherein the amount of applied adhesive composition isgreater than or equal to 200 g/m², and wherein said substrate and saidflexible surface coating, after pulling off, are both capable of beingrecovered without any adhesive residues after removal of the peelablefilm or membrane obtained after drying of the peelable adhesivecomposition.